two days before 中before 词性是什么

two days before 中before 词性是什么 two days before是什么意思 有 two days before 这个结构吗? 英语 two days ago 和the day before yesterday ,two days before two day ago等于 the day before yesterday 和two days before 吗? i have never been abroad before 这个before是什么词性 英语the day before yesterday 等于 two days the day before是否等于two days ago 英语two days ago 和the day before yesterday 区别 RT,two days'的词性是什么 have you seen this TV play____ 为什么添before不是 before two days? have you seen this TV play____ 添before 还是before two days?